Webra 145 pump pressure ?

[Keith Black]

I run Magnum 15% with my Webra 1.45 and it works great. The 10% also runs
fine at least during the cooler months, but this year I decided to stop
switching back and forth with the change of the seasons and just stay with
the 15%. I get 8300+ RPM with a Greves pipe on a 17x10N. I'm now flying the
17x10 standard width but I haven't tacked it. I like the performance of the
17x10 standard much better. I plan on also trying the 17x12N at some point.

Keith Black

----- Original Message ----- 
From: "Lance Van Nostrand" <patterndude at comcast.net>
To: <discussion at nsrca.org>
Sent: Monday, April 04, 2005 10:56 PM
Subject: Re: Webra 145 pump pressure ?


> Paul,
> I've found the Webra loves nitro more than other 2 strokes. Why not up the
> nitro to at least 15 or probably 20.  Not sure what fuel you are using
that
> is 50-50 castor syn.  The omega 11-11 is a rarity.  If you've got it
running
> that well on your weird soup you are doing pretty well.
> --Lance
>
> ----- Original Message ----- 
> From: "Paul Horan" <phoran at vvm.com>
> To: <discussion at nsrca.org>
> Sent: Monday, April 04, 2005 1:56 AM
> Subject: Re: Webra 145 pump pressure ?
>
>
> > Steve,
> >    The 20 and 5% I am refering to is nitro.  I mixed 2 gallons one 5%
> > nitro with castor/synthetic oil and one 15% nitro with all synthetic oil
> > to get 10 % nitro with the oil being composed of 2/3 synthetic and 1/3
> > castor.  I want the castor to guard against wear during break-in.  I am
> > new to tuned pipes, the pipe is long to keep the rpm down during
break-in.
> >    If I understand you correctly, when I shorten the pipe it will richen
> > the mid-range.  Is this correct ?   Currently I am delibrately rich at
the
> > top end and the mid-range is only slightly rich (pinch test).
> >    I am reluctant to mess with the pump and hoping that as I get more
fuel
> > through the engine the mid-range will richen up.  Is that reasonable ?
> >
> > Thanks,
> > Paul
> >
> > ----- Original Message ----- 
> > From: "RC Steve Sterling" <rcsteve at tcrcm.org>
> > To: <discussion at nsrca.org>
> > Sent: Sunday, April 03, 2005 5:13 PM
> > Subject: RE: Webra 145 pump pressure ?
> >
> >
> >> If I am reading your message correct, you are running 25% total oil
(20%
> >> synthenic and 5% castor)??
> >>
> >> If so, that is probably too much oil for the Webra. I once tried 20%
> >> total
> >> oil, and it didn't like it much. I backed down to 17-18% total oil and
it
> >> ran much better. I happen to run all synthetic now, but have tried some
> >> with
> >> a little castor (total oil 18%) and it ran fine on that also.
> >>
> >> 7300 RPM is pretty low on a 16.5 x 12 prop for this engine. I think
most
> >> get
> >> more like 7900 RPM. You may need to adjust pipe length a little. If it
is
> >> anything like my Greve pipe, it really makes a big difference on the
> >> midrange mixture as well. My troubles were with too rich midrange. I'd
> >> try
> >> different fuel, then try a 1/2 inch pipelength change first before
trying
> >> pump pressure.
> >>
> >> -----Original Message-----
> >> From: discussion-request at nsrca.org
> >> [mailto:discussion-request at nsrca.org]On Behalf Of Paul Horan
> >> Sent: Sunday, April 03, 2005 10:09 AM
> >> To: discussion at nsrca.org
> >> Subject: Webra 145 pump pressure ?
> >>
> >>
> >>    My Webra has a good top and bottom end. Only about a gallon and a
half
> >> through it so far.
> >> The top end is nice and smokey, idle is solid, but the mid range is
very
> >> little smoke.
> >> It is on a Prophecy running a 16.5 x 12 at 7300 rpm with the Macs pipe
at
> >> 27
> >> inches.
> >> Most of my flight is at roughly 1/2 throttle.  When I land the oil
> >> residue
> >> on the coupler and
> >> fuselage is medium brown - fuel is a mix of 20 % synthetic and 5 %
castor
> >> synthetic.
> >> Main needle is open 1.5 turns.
> >>    I am wondering if I should increase the pump pressure to richen up
the
> >> midrange.
> >> Or am I just being too fussy ?
> >> Thanks,
> >> Paul Horan
> >> KC5NF
> >> AMA 57131
> >> NSRCA 3606
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